If it were me....just sayin', I'd probably go out and shoot it a few more good range sessions, make sure you actually like the rifle and no major warranty issues, before you order a chassis and other custom options. You never know, you might actually like the chassis that came with your Tac. It has a reputation of being a pretty decent factory chassis, capable of VERY good accuracy.
If you decide to upgrade, this chassis is drop-in. On mine, the entire thing with the buttstock and options I selected, is only 3 pounds! Almost unheard of for a chassis, and you can make it lighter still if you want to fork over more $$$ for the magnesium version of the Element 3.0 chassis, and then add a lightweight buttstock. XLR is outstanding on customer service. In fact when you go to buy your chassis, I'd actually research options on their site, write down what you THINK you want, then call them first, ask for Matt. Have him walk you through the options for your rifle on the Element chassis. There are quite a few choices to make and it's easy to pick something without realizing it's incompatible or what impact it'll have on you. For example, you could choose a standard AR buttstock like a CTR or something, but theirs are actually much better IMHO, very lightweight but more adjustable.
I like an adjustable stock, and think it's well worth it. Also, don't make the mistake of cutting corners and skipping the folding stock. Almost everybody is gonna end up benefitting from that feature, not only for compact carry in a shorter rifle bag, but because it makes it easier to remove your bolt for cleaning.
Last thing, the brake. If you're not gonna run a can, definitely run a brake, and the APA brake I have on here is possibly the best one you can get judging by what PRS competitors use. See this comparison and ranking
article. However, "best" is a tricky thing. It's outstanding at reducing recoil, obviously the main job of the brake. I found however the blast was more than I like, and switched to another brake that's not as good at recoil reduction but has reduced blast. But other folks, like my gunsmith and range partner, say the blast doesn't bother them as long as they double up plugs + muffs. My gunsmith says the APA "little bastard" for 6.5 CM is the brake he gets asked to mount on more range rifles than any other brake.
So if you're interested in the APA, mine's for sale, barely used, I think maybe 100 rds through it. :-) PM if interested, I haven't even listed it yet.